Releasing sessions. Time since pool creation: 0Session 1 took 0 seconds to be released.Session 2 took 0 seconds to be released.Session 3 took 0 seconds to be released.

(same for time=1..8)

Releasing sessions. Time since pool creation: 9Session 1 took 0 seconds to be released.Session 2 took 12 seconds to be released.Session 3 took 11 seconds to be released.

Releasing sessions. Time since pool creation: 34Session 1 took 0 seconds to be released.Session 2 took 11 seconds to be released.Session 3 took 12 seconds to be released.

Releasing sessions. Time since pool creation: 58Session 1 took 0 seconds to be released.Session 2 took 12 seconds to be released.Session 3 took 12 seconds to be released.

With expired time < timeout, the time to release sessions is zero. After that the release time is approximately equal to the timeout, and this is true for all other timeouts tested: 20, 5 and 0 seconds, so a quick workaround is simply to set the timeout to zero.

Cause

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